Rotary and method of securing the pipe-gripping device thereon.



H. R. DECKER.

ROTARY AND METHODHQF lSECURING THE PIPE GRIPPING DEVICE THBREON.

' 'APP'JIGATION FILED PBB.27, 1911.

1,054,5 l 2. Patented Feb. 25, 1913.

H. R. DECKER. ROTARY AND METHOD 0F SEGURING THE PIPE GHHPINU LIEVUTE [HLRFONl APPLIUATION FILED Nana uf. w11

1,0545 1 2. 1mm-mmf Feb. 25.1913.

UNITED STATES PATENT OFFICE.

HARRY R. DECKER, OF HOUSTON. TEXAS.

ROTARY AND METHOD OF SECURING THE PIPE-GRIPPING DEVICE THEBEON.

To all whom, it ma 1]v concern Be itknown that I, HARRY lt. DncRER, a cit-izen of the United States, residing at Houston, in the county of Harris and State of Texas, have invented certain new and useful Improvements in Rotaries and the Method of Securing the Pipe-(Stripping Device Thereon, of which the following is a specification.

My invention relates to new and useful improvements in rotaries and the method of securing the pipe gripping device thereon.

In devices of the character described the pipe gripping members are connected. by connecting shafts, which pass through suitable supports carried by the rotary table, and it is a fact well known to those familiar with rotary drilling, that the power transmitted from the rotary table to the drill stem, or pipe, must be transmitted through said connecting shafts, and when hard strata are encountered the power, which must necessarily be transmitted, is often sufficient to bend or entirely break said connecting shafts.

It is the objectof this invention to relieve the connecting shafts of this strain by means of a novel construction whereby, the rotation of the rotary table will be transmitted directly to the pipe gripping members. With the above and other objects in view my invention has particular relation to certain novel features of construction and operation, an example of which is given 1n this specification and illust-rated in the accompanying drawings, wherein Flgure 1 is a plan view of a complete rotary equippedwith my improvement. Fig. 2 is a sectlonal sideelevation thereof, and Fig. 3 is a perspective view of a means for supporting .the pipe gripping device on the rotary table.

Referring more partic-ularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures, the numeral 4 designates the bed frame of the rotary, whereon is mounted the base plate 5 provided with the race way ring 6 which receives the antifrict-ion rollers 7.

The numeral 8 refers to the. rotary table which has, upon its under surface, the race way ring 9, which receives and seats on rollers 7. This table is driven by the bevel gear 10, rigidly mounted on shaftV 11, and meshing with a bevel gear face on the under Specification of Letters Patent. Application tiled February 27, 1911. Serial No. 611.084.

-responding corner blocks.

Patented Feb. 25, 1913.

side of the rotary table. The shaft 11 is driven through the sprocket wheel 1;. rigidly mounted thereon, and receiving power from a suitable motor (not shown). drum 13 passes through the central opening of the rotary table and carries, upon its periphery, longitudinal ribs 1-1 which fit in to corresponding grooves 15 in the inner wall of said table, and force the drunlto rotate with the table.

The pipe gripping device includes two oppositely disposed pi e gripping members which are connected y suitable screw connecting shafts 16, and 17. Each gri ping member is composed of two corner b ocks, as 18, supporting a grip ring shaft 19 which carries the grip rings 20 and 21. Each of the screw connectin shafts has ends oppositely threaded an said ends have screw connections with the corresponding'corner blocks so that by a suitable manipulation of the screw connecting shafts the gripping members may be spread or drawn together and the grip rings 20 and 21 loosened or tightened on the pipe. These corner blocks may be integral with or detachable from the grip rin shafts.

The rum 13 has at its upper end the pairs of opposite laterally diverging fingers 22 and 23through which the respective screw shafts 16 and 17 pass and by which said screws are supported and held in posit-ion relative to the drum. The shafts 16 and 17 are enlarged into nuts 24 and 25 between their supporting fingers by means of which said shafts are turned.

The under side of the corner blocks 18 have dove tail grooves 26 the groove ofeach block ali-ing with the groove of the corresponding block, and the drum 13 carries the oblong cross bars. or t-rackways. 27 and 28 which are integral with the said drum and arranged parallel and on opposite sides thereof. The bars 427 and 28 are, respectively, provided on their upper sides with tongues 29 and 30 conforming in shape to,

The

and fitting into the grooves 26 of their cor- These tongues and their corresponding grooves aline with the corresponding screw connecting shaft, on each side and as the screw shafts are manipulatedlthe corner blocks move back and forth on their trackways. As shown in dotted lines in Fig. 1, the grooves 26 are narrowest at the center of the block and diverge slightly each way therefrom, s o thatl the tongues 29 and 30 will have a swiveling movement relative to the blocks. This Construction is provided so that the screw connecting shafts may be alternately manipulated and their blocks alternately spread or drawn together. This would not be possible were the said tongues made to tit closely in their grooves, Without bending the bars carrying said tongues.

It is to be observed that the drum 13 is not essential but separate supports may be provided having fingers Q2 and 23 at their upper ends thereof and carrying the respective cross-bars 27 and 28 for the purpose heretofore specified.

It is readily apparent that the rotation imparted to the pipe gripping device will be transmitted from the support therefor through thc cross-bars 27 and 2S and the connecting shafts 16 and 17 will be entirely relieved of the stress to ivhich they would be subjected were they required to transmit rotation from Vthe rotary table to the pipe gripping device. and it. is also obvious that that the pipe gripping device may be elevated relative to the rotary table and the pipe gripping members will at all times,

ave a direct drive from said table.

lhat I claim isti l. In a device of the character described the combination with a rotary table; of a pipe gripping device carried thereby composed of suitable pipe gripping members, corner blocks supporting the same and connecting shafts connecting said corner blocks; supporting means engaging with said corner blocks and also with the rotary table and transmitting rotation from said table to said pipe gripping device.

2. In a device of the character described the combination with a rotary table: of a pipe gripping device carried thereby composed of suitable pipe gripping members, corner blocks supporting the same and connecting shafts connecting said corner blocks; a supporting member carried by a rotary table and suitable engaging means carried by said support-ing member and engaging with said corner blocks and transmitting rotation from said tableto said pipe gripping device.

3. In a device of the character described the combination With a rotary table; of a pipe gripping device carried thereby composed of suitable pipe gripping members, corner blocks supporting the same and connecting means connecting said corner blocks; a supporting member carried by the rotary table; and laterally extending bars carried by said lsupporting member and having a sliding engagement in grooves in said corner blocks.

4. In a device of the character described, the combination with a rotary table; of a pipe gripping device carried thereby, said gripping device being'composedof pipe gripping members and mean-s connecting the same; a supporting` member engaging with thc pipe gripping members and having` slidable engagement with the rotary table and transmitting rotation from the latter to the former. I

5. In a device of the character described,

the' combination with a rotary table; of al pipe gripping device carried thereby. copiposed of suitable pipe gripping members, corner blocks supporting the same and connecting shafts connecting lsaid cornerblocks; supporting means engaging with said ycorner blocks and having slidahle engagement lwith the rotary table and transmitting rotation from sai-d table to said pipe gripping device.

6. In a device of the character described the combination with a rotary table; of a pipe gripping device carried thereby, composed of suitable pipe gripping members and means connecting the same; a supporting member having slidable engagementwith the rotary table and supporting said pipe gripping member, and laterally eX- tending means carried by the supporting member and having slidabie engagementwith. the pipe gripping members.

In testimony whereof I have signed my name to this specification in the presence of tivo subscribing Witnesses.

HARRY R. DECKER. Witnesses:

J. W. Ymouer, A. TOMPKINS.

Copies of this patent may be obtained for tive cents each, by addressing the Commissioner of Patents, Washington, D. C. 

